Shaft motion mechanism for looms



Dec. 4, 1951 J. c. lwALD 2,577,126

SHAFT MOTION MECHANISM FOR Loon/1s Filed Dec. 14. 1949 2 SHEETS-SHEET 1 f4 20,v /1 2 C@ sgf/J j ,5. w Flc-'5.1

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UVVENTOR John/7 [ar/ fwn /Q ATTORNEY Dec. 4, 1951 J. c. lwALD SHAFT MOTION MECHANISM FOR LOOM-Sv 2 SHEETS-SHEET 2 INVENTOR Filed Dec. 14. 1949 ATTORNEY Patented Dec. 4, 1951 UNITED STATES PATENT OFFICE SHAFT MOTION MECHANISM FOR LOOMS Johan Carl Iwald, Rorosjon, Sweden Application December 14, 1949, Serial No. 132,901

1 Claim.

This invention relates to shaft motion mechanism for looms, particularly hand looms,-and the principaI object of the invention is to provide means which simplify the operation of the loom and vrender possible the composition of patterns of a great Variety. A further object is to provide a shaft motion mechanism in which top jacks, long treadles and short treadles can be entirely dispensed with. A still further object of the invention is to provide an improved shaft motion mechanism in which all of the shafts Which are not lowered during the shaft motion are automatically lifted into their upper positions.

I attain these objects by mechanism illustrated in the annexed drawings, in which:

Fig. 1 is a diagrammatic side elevation of a hand loom;

Fig. 2 is an end elevation, to an enlarged scale, of the loom as viewed from the left in Fig. 1 and with several members omitted which form no part of the invention;

Fig. 3 is a top view, to a still larger scale, of the shaft motion mechanism; and

Fig. 4 is a front elevation of this mechanism.

Referring to Fig. 1, numeral I denotes some of the uprights of the frame of the loom, and numeral II denotes the slay beam having the reed with the dents I5. by two interconnected bars I2 which at I 6 and I'I are pivotally connected to arms I3 and I4, respectively. The arms are pivotally mounted in bearings 20 and I 8, respectively, secured to the frame structure. In operation, the slay beam is reciprocated, together with the bars I2, between the positions indicated in full lines and dotted lines. Numeral I9 indicates diagrammatically the upper portion of the shaft portion mechanism, the shafts being not shown in Fig. 1.

As will appear from the following description, the loom illustrated is assumed to comprise twelve shafts, two of these shafts being illustrated in Fig. 2, one shaft comprising the upper shaft stave 2Ia and the lower shaft stave 2lb and the other shaft comprising the upper shaft stave 22a and the lower shaft stave 22b, the upper and lower shaft staves being interconnected by the heddles 23. The treadles are diagrammatically indicated at 24. There are provided twelve treadles which by means of cords 25 are connected with the lower shaft staves.

As will be seen from Figs. 3 and 4, the shaft motion mechanism is enclosed by a rectangular frame 26. Near each end of the frame, there are provided two fixed shafts 21 and 28, one above the other, and each shaft has mounted thereon The slay beam is carried 2 twelve individually rotatable guide rollers 29 and 39 respectively. Between the two groups of guide rollers, there are freely suspended two twin rollers 3l, 32 and single rollers 33, all of these rollers being interconnected by cords in the following manner.

From the holder 33a of the rst single roller 33, a cord 34 runs over the roller 3l of the first twin roller and over the roller 3| of the second twin roller and, finally to the holder 33h of the opposite single roller 33. Over the other rollers 32 of the twin rollers, there run straps 35 which at their ends are connected to the holders of two single rollers 33. Straps 33 running over the single rollers 33 are at their end connected to eyes 31. To each eye 31 there are secured two shaft cords 38 and 39. Shaft cord 38 runs over a guide roller 30 and is secured at 40 to one end of an upper shaft stave 2Ia, while shaft cord 39 runs over a guideroller 29 and a similar guide roller 29 at the opposite end of the frame 23 and is secured at 4I to the other end of the upper shaft stave 2 la. In a similar manner, the other shaft cords 38 and 39 are connected to their respective upper shaft staves, twelve shafts being provided in accordance with the twelve pairs of guide rollers 29, 30, each shaft being suspended substantially below the appertaining guide rollers.

Due to the arrangement described, all of the shaft staves are always held in horizontal positions, and the treadle cords or wires 25 can be connected directly with the lower staves of the shafts at places right above the treadles without intermediate short treadles, long treadles and top jacks or top levers being also dispensed with. Further it will be evident that upon depressing of one or more treadles and consequent lowering of the appertaining shafts, all of the other shafts will simultaneously be lifted to their upper positions. The shaft motion mechanism described renders possible the composition of patterns of a great variety. While in looms of usual types, the, number of different shaft motions is equal to the number of shafts, since one treadle only can be depressed for each shaft motion, the mechanism described above can be operated by depressing one, two or more treadles at the same time with the result that the number of different shaft motion combinations which canbe obtained is at least eoual to the square of the number of shafts provided in the loom.

While in the foregoing the loom has been assumed to comprise twelve shafts, it will be understood that the invention is not confined to a certain number of shafts. If more shafts or less shafts are used, the number of rollers has to be y increased or reduced accordingly. Generally, half of the single rollers 33 have to be placed on either side of the twin rollers.

What I claim is:

A shaft motion mechanism for looms, comprising two pairs of parallel fixed shafts, guide rollers mounted for individual rotation on said shafts, upper shaft: staves below said rollers, lower shaft staves, hed'dles connectingA said lower to said upper shaft staves, treadles for depressing said lower shaft staves, single rollers and twin rollers suspended between said pairs of parallel shafts, holders for said single rollers and twin rollers, a first shaft cord connected to one end of a shaft stave, a second shaft cord. con

nected to the other end of said shaft stave,

means connecting said shaft cords to each others` said rst shaft cord running from said shaft stave overone'- of' the guide rollers; on one ofi the shafts; of onev pair and to; said connecting means, said secondV shaft.l oord; running from; said con.-

necting means over one of the guide rollers on the other shaft of said pair and over one of the guide rollers onra shaft of the other pair and to said shaft stave, a strap running over a single roller and connected at one end to said connecting means and at the other end to a connecting means for other two shaft cords, straps running over one roller of each twin roller and connected at each of their ends to a holder for a single roller', and a; cord connected to the holder of one of the single rollers and running over the other rollers of said twin rollers and connected to the holder of another one of Ysaid single rollers.

JOHAN CARL WALD.

REFERENCES CTEB Y FOREIGN PATENTS Country Date Norway May 12, 19417 Number 

